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jLEwis RiooNfiRi), or rniiiiiDELri-iia, PENNsrLvANiA.

BLOCK Stine-VALVE non STEAM-ENGINES.

. `slznmiiication of Letters Patent No, `11,320, dated July" is, i854.

T0 all whom t mag/,concern Be it known that I, Lewis R. Coriano, of

the city and county ofPhiladelphia and State of Pennsylvania, have invented a new and useful Improvement in Slide-Valves of- Steam-Engines, which consists informing the openings or passagesin a` sliding valve,. in such manner and shape, that they" enter longitudinally on one surface ofthe valve` and pass out transversely, or `at right angles at the opposite surface, whereby pressure of steam upon the valve,` tendingto press it upon adjoining surfaces, is re` moved, and the frictionconsequent upon` such pressure is obviated; and Ido hereby declare the following to abe a full, elear, and` exact description of the construction and operation of the same, reference being had to the annexed drawings and the letters of reference thereon, `making apart of this specification.

Figure 1, is a sectional elevation of the sliding valve, and seats, the upper portion of the figure showing the steam or feed pipe, and exhaust openings, the lower porw tion, showing a broken section of the pas-V sages leading to either end of the cylinder. Fig. 2, is a vertical transverse section through the center of Fig. l, showing the steam pipe and passage, and the clamp for tightening the valve in its chamber. Fig` 3, is a perspective view ofthe sliding valve,

showing the relative position and form of` t-he openings therein, by dotted lines- Fig. 4 is an inverted view of the upper side of the valve box orcover. Fig. 5, is a plan of `the valve seat, showing the ingress and egress openings, to the side pipe of the cylinder.

Where the-same letters occur in diferent figures they indicate the same parts.

O, is the sliding valve, having a reciprocating motion, produced by the valve rodL being connected with an eccentric, or other device for producing the required stroke at the proper time, in the manner of the common slide valve, and has three openings entirely through as E, X, F, A, and E, X, the two openings E, X, enter at the top of the valve, (supposing it to lie horizontally) transversely to its length, and pass out at the lower side,- longitudinally thereto. The center or steam passage F, A, enters at the top at F, longitudinally and passes out at the lower side at A, transversely as seen in Fig. 3.

M is the seat oni-or `against which the valve moves back and forth, and is pierced with two oblong parallel transverse steam ports Zi, f l, leading to either end of the cylinder, which are opened andfclosed alternately, by the reciprocating movement of the valve;

and two longitudinal exhaust openings e, 7,

corresponding in position, withthe exhaust openings X, X, in the `under part of the sliding valve, but of less length, 4so that in whatever position the valve may be, the

openings e, j", shall bealways fully open.

`N, is the cover of 'the valve chamber, pierced with lthree oblong openings a, `g, it, Fig. il) 1the same size as those in plate M,

(that is to say, the longitudinal opening u, m

corresponding with the openings e, f, in said plate M; and the transverse openings g, It, withmthose o, `cZ,) but each at rightangles to its opposite. `gl, h., are the two exhaust openings, leading to the outlet K, through the curved ways z', j, and are opened and closed alternately, by `the action of the valve, while the longitudinal opening o, is always open to the valve, and communicates di* rectly with the steam boiler `through theV steam pipe C.

The valve above described is made narrower, or of less thickness, at its inner than its outer surface, its upper surface being inclined so as to act as a wedge against the corresponding inclined surface of the cover or top of the valve chamber, in such manner as to enable it to be forced inward by clamps Q and set screws P, to tighten it between vthe vupper and lower surfaces of its chamber, to the required degree to prevent the escape of the steam.

By referring to Fig. l, it will be seen that the steam is admitted atA C, passing in the direction of the arrows, through the longitudinal openings a, and F, which are `never even partially closed, during the reguarrow, through the transverse openings,

E, 7L at the opposite surface of the valve and the cover' thereof, while the other exhaust passage is stopped by the transverse opening E, coming against the upper surface of the valve chamber, and vice versa,`

when the valve is at the opposite end of its stroke; the passagesbeing all cut off only during the moment that the opening A, is over the transverse central face R, of the valve seat, this valve never presents any exterior surface to the pressure of the steam, and the inlet and outlet openings in it being of the same area, and' the steam in the passages of the valve pressing against the dead or stationary surfaces of the upper and lower portions of the chamber in which it is contained, when, not communicating with the transverse openings in said surfaces, corresponding with their transverse outlets and inlets, therefore, has no inclination to press against either surface of the chamber inclosing it, .and is consequently very durable, and is easily adjusted and kept steam tight by the clamp and set screws Without even stopping the engine.

By making the outlets and inlets of the openings in the valve, at right angles to each other, in the peculiar manner represented and described, to co-rrespond with the openings in the surfaces of the chambers, with which they communicate, the longitudinal oblong entrances from the steam pipe and exhaust openings of the cylinder', into the which short-ness of throw of the valve` would not accomplish the object, were the openings in said valve of any other form than that represented and described.

What I kclaim as my invention and desire to secure by Letters Patent is- Forming the passages through said valve, so that the oblong steam and exhaust openings shall enter from the upper and lower surfaces, longitudinally to its motion, and leave the opposite surfaces, transversely thereto, as herein described.

LEwIs n. ooNARD;

Witnesses:`

C. BRAZER, W. P. BRAZER. 

